Cart (
Overview
The LCD display on a Graviner MK6 oil mist detector control unit is the window through which the engineering team reads everything that matters about their crankcase explosion protection system — oil mist concentration levels across all monitored channels, alarm status, system health information, and fault conditions. When that display fails or degrades, the system does not stop detecting. But the engineering team loses the ability to read what the system is detecting — and a safety system you cannot read is a safety system you cannot act on correctly.
The Graviner MK6 LCD Display, Part No. 43785-K120 is the latest revised LCD display component for the Graviner MK6 oil mist detector. It replaces a failed, degraded, or damaged LCD display module on the MK6 control unit — restoring full visual readout of all system data and alarm information to the engineering team, without requiring replacement of the entire MK6 control unit or main PCB assembly.
What distinguishes the 43785-K120 from earlier MK6 LCD display components is its revised specification — and its compatibility scope. The 43785-K120 is fully interchangeable with any version of the MK6 OMD main PCB at Revision 6 or newer. This broad compatibility across the current MK6 PCB revision range makes it the correct replacement display for the overwhelming majority of MK6 installations currently in service in the commercial marine fleet. One important compatibility note: if the MK6 control unit in question has an older main PCB below Revision 6, the 43785-K120 is not compatible and a different display specification will be required — confirming the main PCB revision before ordering is the correct procurement step for this component.
Key Features
Latest Revised LCD Display — Improved Specification Over Earlier MK6 Displays
The 43785-K120 is the latest revised LCD display module for the Graviner MK6 — not simply a like-for-like spare for the original display component. The revised specification reflects Graviner’s own updated display solution for the MK6 platform, incorporating improvements over the earlier display design. For vessels replacing a failed MK6 display, fitting the latest revised display module is the correct approach — providing the current-specification display rather than a replacement that matches the age-related limitations of the original component.
Full Interchangeability with MK6 Main PCB Revision 6 and Later
The 43785-K120 is confirmed as fully interchangeable with any version of the Graviner MK6 OMD main PCB at Revision 6 or newer. Given that the majority of MK6 control units currently in service carry a main PCB at Revision 6 or above, this broad compatibility range means the 43785-K120 is the correct LCD display replacement for most MK6 installations without requiring individual PCB revision investigation beyond confirming the revision is 6 or newer. For procurement teams and service engineers sourcing MK6 display spares for a fleet, this broad compatibility simplifies the procurement process significantly.
Direct Drop-In Replacement for the MK6 Control Unit Display
The 43785-K120 is designed as a direct replacement display module for the MK6 control unit — with the correct connector, mounting dimensions, and display interface to install into the existing MK6 front panel display aperture without modification. For marine engineers carrying out the replacement on board, a direct drop-in replacement is the component that minimises installation time and eliminates the risk of installation complications — important when the replacement is being carried out during a port call or under survey time pressure.
Restores Complete System Readout Visibility
A functioning LCD display on the MK6 control unit provides the engineering team with continuous visibility of oil mist concentration readings across all monitored engine channels, alarm status and alarm history, system operational mode, and any active fault conditions. Replacing a failed or degraded display with the 43785-K120 restores all of this information to the engineering team — returning the MK6 system to its intended operational state, where the system is not only detecting but providing the readable, actionable information that allows the engineering team to respond correctly to any developing crankcase condition.
Available in New and Refurbished Condition
The 43785-K120 is available in both new and refurbished condition. New condition components provide factory-fresh supply with full remaining service life. Refurbished condition components — inspected and tested before supply — provide a cost-effective and often more rapidly available alternative for vessels where procurement budget, lead time constraints, or the age of the existing MK6 installation make a refurbished component the more practical procurement choice. Both condition options are available from Alright Engineering Solutions; contact our team to confirm current stock availability for each condition.
Technical Specifications
Manufacturer: Graviner (a Kidde brand)
Part Number: 43785-K120
Description: MK6 Oil Mist Detector LCD Display (Latest Revised)
Compatible System: Graviner MK6 Oil Mist Detector Control Unit
PCB Compatibility: MK6 OMD Main PCB Revision 6 or newer (not compatible with earlier PCB revisions)
Category: Oil Mist Detector Spare Parts
Condition: New and Refurbished (both available)
Benefits
Returns full operational visibility to a safety-critical crankcase protection system. An MK6 system with a failed display is a system where the engineering team is flying blind — the detection may be functioning, but without a readable display, concentrations cannot be monitored, alarm histories cannot be reviewed, and fault conditions cannot be identified. The 43785-K120 restores that visibility, returning the MK6 to the operational state it needs to be in for the engineering team to manage crankcase safety correctly.
Latest revised display specification — not just a like-for-like replacement. Fitting the 43785-K120 means the MK6 system is equipped with Graviner’s current revised display solution, rather than a replacement that simply replicates the age-related limitations of the original component. For vessels investing in MK6 maintenance, the latest revised display component is the appropriate standard.
Avoids the cost of full MK6 control unit replacement due to a display failure. A display failure is a component-level fault — not an indication that the entire MK6 control unit needs to be replaced. The 43785-K120 addresses the specific failure mode at component replacement cost, preserving the investment in the existing MK6 installation and avoiding the significantly higher cost of a complete control unit replacement.
Broad MK6 PCB revision compatibility simplifies fleet procurement. For ship management companies and marine equipment suppliers maintaining MK6 display spares for multiple vessels, the confirmed compatibility of the 43785-K120 with all MK6 main PCBs at Revision 6 and above means a single display part number covers the majority of the MK6 fleet — simplifying spare parts inventory management and reducing the risk of procuring the wrong display variant for a specific vessel.
New and refurbished options provide procurement flexibility. The availability of both new and refurbished condition supply means the 43785-K120 can be sourced against the procurement requirements of the specific situation — new condition for vessels requiring factory-fresh components as a maintenance standard, refurbished condition for vessels where cost or lead time considerations make a tested refurbished component the more practical choice.
Who It’s For
The Chief Engineer or Second Engineer Managing MK6 Display Failure On Board
The LCD display on your MK6 control unit has failed — it is blank, partially visible, or showing corrupted characters. The underlying detection system may still be functional, but without a working display you cannot read oil mist concentrations, confirm alarm status, or check the system for fault conditions. You need to confirm your MK6 main PCB revision, verify the 43785-K120 is compatible, and source the replacement display as quickly as possible — ideally before the vessel’s next port call, and certainly before the upcoming class survey where the system will need to be presented as fully operational.
The Marine Equipment Service Engineer or Graviner Service Technician
You service Graviner MK6 systems on vessels at port and during drydocking periods. MK6 LCD display failure is one of the most common component-level faults you encounter on ageing MK6 installations — and having the 43785-K120 available in your service stock means you can carry out the display replacement during the same service visit where the fault is diagnosed, rather than returning on a follow-up visit once the spare has been procured. Confirming the vessel’s MK6 main PCB revision before attending is the standard pre-visit check for this component.
The Fleet Technical Superintendent Planning MK6 Preventive Maintenance
You manage a fleet with Graviner MK6 installations across multiple vessels, and you know from experience that LCD display degradation is a predictable maintenance item on long-service MK6 control units. Provisioning 43785-K120 display modules as ship’s spares on vessels whose MK6 main PCBs are confirmed at Revision 6 or above is the proactive maintenance step that keeps the MK6 systems across your fleet operational and display-ready — avoiding the reactive scramble of sourcing a display spare after a failure occurs on board at sea.
Possible Applications
- Failed or blank MK6 display replacement — Emergency replacement of a completely failed MK6 LCD display during vessel operations, restoring system readout visibility before the next port call or survey
- Degraded or partially visible display restoration — Planned replacement of an MK6 display showing reduced contrast, partial character corruption, or intermittent display failure before the fault becomes a complete display failure
- Pre-survey MK6 system restoration — Display replacement carried out in advance of class renewal surveys, annual surveys, or port state control inspections requiring the MK6 system to be presented in fully operational condition
- Drydock planned maintenance programmes — Systematic display replacement on MK6 control units as part of a comprehensive planned maintenance overhaul during scheduled drydocking periods
- Second-hand vessel acquisition and MK6 system recommissioning — Display replacement as part of a full MK6 system inspection and restoration programme following vessel purchase, change of management, or return from layup
- Marine equipment service company service visits — Component held by authorised Graviner service agents for supply and installation during contracted MK6 service and maintenance visits at port or during drydocking
- Fleet spare parts inventory provisioning — Maintained as a standing ship’s spare on vessels with MK6 installations at PCB Revision 6 or above, ensuring display replacement can be carried out on demand without procurement lead time dependency
- Marine spare parts distributors — Stocked as a Graviner MK6 spare parts item for supply to vessels, ship managers, and service engineers requiring the 43785-K120 at short notice
Trust and Certifications
Graviner — A Kidde Brand, Long-Established in Marine Crankcase Protection
Graviner has been producing marine crankcase explosion protection equipment for decades, with MK6 and MK7 oil mist detector installations across thousands of commercial vessels globally. The MK6 is a mature, class-approved platform with a well-documented maintenance history — and the 43785-K120 is the manufacturer’s own revised display component for this system. Sourcing MK6 spare parts under Graviner OEM part references provides the specification assurance and traceability that safety system maintenance requires, and that classification society surveyors expect when reviewing a vessel’s maintenance records.
SOLAS Chapter II-1 — Crankcase Explosion Protection Compliance
SOLAS Chapter II-1 requires crankcase explosion protection on main propulsion engines above a specified cylinder bore. The Graviner MK6 is an accepted means of compliance with this requirement. Maintaining the MK6 system in fully operational condition — including a correctly functioning LCD display through which the engineering team can read system status and alarm information — is a component of the vessel’s ongoing SOLAS compliance. Replacing a failed display with the OEM-referenced 43785-K120 is the correct maintenance standard for restoring this compliance-relevant function.
Classification Society Type Approval — Graviner MK6
The Graviner MK6 carries type approval from major classification societies including Lloyd’s Register, DNV, Bureau Veritas, ClassNK, and ABS — confirming the system design meets the relevant crankcase explosion protection standards against which class surveyors assess the system during periodic surveys. Using the manufacturer-referenced 43785-K120 display component is consistent with maintaining the MK6 in its type-approved configuration, and provides the OEM traceability required for accurate survey documentation.
PCB Revision Compatibility — Important Pre-Order Verification
The 43785-K120 is confirmed compatible with MK6 OMD main PCBs at Revision 6 or newer. This compatibility information is provided by Graviner as part of the component specification — confirming the main PCB revision of the specific MK6 control unit before ordering is the correct procurement step, and Alright Engineering Solutions can assist with guidance on identifying the MK6 PCB revision if required.
Supplied by Alright Engineering Solutions
The Graviner MK6 LCD Display 43785-K120 is supplied through Alright Engineering Solutions Pte. Ltd., a Singapore-based authorised distributor of marine safety and gas detection equipment. Both new and refurbished condition stock is available; contact our team to confirm current availability for each condition and to discuss lead time and delivery options for your vessel’s location and timeline.
Accessories and Variants
Graviner MK6 Membrane Function Key Front — Part No. 39155-K047
For MK6 control units where both the LCD display and the front membrane keypad require replacement — a common situation on long-service MK6 installations where both components have accumulated the same years of service — the 39155-K047 membrane function key front panel assembly provides the front keypad restoration to complement the 43785-K120 display replacement. Alright Engineering Solutions can supply both components together for a complete MK6 operator interface restoration package.
Graviner MK6 Commissioning Kit — Part No. D9221-026
Following an LCD display replacement, a functional test and recommissioning of the MK6 system — using the Graviner D9221-026 commissioning kit, compatible with both MK6 and MK7 units — confirms the system is operating correctly with the new display installed, and provides the documented functional verification required for post-maintenance survey purposes.
Additional Graviner MK6 Spare Parts
Alright Engineering Solutions can assist with sourcing additional Graviner MK6 spare parts alongside the 43785-K120 display — main PCB assemblies, power supply components, detector heads, communication modules, and other MK6 system spare parts — for vessels requiring a broader MK6 maintenance programme. Contact our team with your MK6 part references and requirements for availability and quotation.
Related Products from Alright Engineering Solutions
Graviner MK6 Membrane Function Key Front 39155-K047 — OEM front panel keypad replacement for the MK6 control unit operator interface
Graviner Commissioning Kit D9221-026 — MK6 and MK7 commissioning tool set for functional testing and alarm threshold verification
Portable Multi-Gas Monitors (ATEX/MED Certified) — For confined space entry and hazardous area gas testing in engine rooms and cargo spaces
Marine Safety System Spare Parts — Fire detection, gas detection, and safety system spare components across a wide range of OEM platforms in the commercial marine fleet
Get in Touch
If you need to source the Graviner MK6 LCD Display 43785-K120 — whether for an urgent on-board display replacement, a pre-survey restoration, a drydock maintenance programme, or fleet spare parts provisioning — contact Alright Engineering Solutions to confirm stock availability in new or refurbished condition and request a formal quotation.
Please confirm your MK6 main PCB revision is Revision 6 or newer before ordering. Our team can assist with guidance on PCB revision identification if required.
📍 3791 Jalan Bukit Merah #06-01, E-Centre @ Redhill, Singapore 159471
